Introduction
Page 1
Experiment 1:
Intro/Method
Pages 2-3
Experiment 1:
Results
Page 4
Experiment 1:
Discussion
Page 5
Experiment 2:
Intro/Method
Page 6
Experiment 2:
Results
Page 7
Experiment 2:
Discussion
Page 8
Experiment 3:
Intro/Methods
Page 9
Experiment 3:
Results
Page 10
Experiment 3:
Discussion
Page 11
General Discussion
Page 12
Figures 1-2-3
Pages 13-14-15
Tables 1-2-3
Pages 16-17-18
The absolute levels of attack for competitive and territorial fighting were similar to those obtained in Experiments I and 2. The attack frequency for competitive fighting was 1.13 at 24-h deprivation, which compares favorably to 0.94 for all rats and 1.18 for normal rats at 24-h deprivation in Experiment 1. The attack frequency for territorial fighting with no deprivation was 3.00, which is close to the 2.74 for resident males against male intruders in Experiment 2. See Table 3 for the full data.
As shown in Fig. 3, the two types of fighting are quite different in their response to food deprivation. Whereas competitive fighting increases with increasing deprivation, territorial fighting decreases dramatically with increasing deprivation. The difference in attack frequency is highly significant by the analysis of variance in terms of the interaction between type of test and level of deprivation (F = 8.76, p < 0.001).
The data for offensive sideways posture parallel the data for attack frequency, as shown in Table 3. In competitive fighting the rate increases from 0.13 at no deprivation to 1.53 at 36-h deprivation. In territorial fighting it decreases from a rate of 2.17 at no deprivation to a rate of 0.87 at 36-h deprivation. Analyzed by analysis of variance, this effect is significant as well (F = 5.25, p < 0.002) in terms of the interaction between test and deprivation level.
The main effects were not significant in the analysis of variance, either for attack frequency or offensive sideways posture frequency.
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